Discuss with elbow partner Peggy Sue observes hummingbirds landing on mostly red flowers She wants to find out if they will also go to blue flowers She fills twenty feeders with red sugar water and ID: 404697
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Slide1
Bell Ringer:
Discuss with elbow partner:
Peggy Sue observes hummingbirds landing on mostly red flowers.
She wants to find out if they will also go to blue flowers. She fills
twenty feeders
with red sugar water and
twenty with
blue sugar water & counts the # of birds that go to each feeder during 6 hours.
Control?
Independent
variable?
Dependent variable?Slide2
Quick Review of the SIX steps of the Scientific MethodSlide3
ASK
ANN
ASK A QUESTION
based on observationsSlide4
H
Y
P
O
T
HESIS
Has
Form a hypothesis
which is a possible explanation for what you have observed.Slide5
TEST
twenty
Test the hypothesis
by conducting experiments.Slide6
A
N
A
L
Y
ZE
adorable
Analyze the results
collected from experiments.
.Slide7
DRAW
C
O
N
C
LUSION
S
dogs
DRAW CONCLUSIONS
from the results of your experiment.
.Slide8
C
O
M
M
U
NICATE
RESULTS
cats
COMMUNICATE results
to other scientists.Slide9
Quick Review of the 3 guidelines to a good controlled experiment.Slide10
Have a
control group
which is used for comparison.
1.Slide11
2.
Test only ONE thing at a time—have only one independent variable.Slide12
3.
Have the largest possible sample size.Slide13
Practice identifying
a Control Group, Independent
Variable and
Dependent From a Question.Slide14
Bell Ringer:
Discuss with elbow partner:
Peggy Sue observes hummingbirds landing on mostly red flowers.
She wants to find out if they will also go to blue flowers.
She fills 2
0 feeders
with red sugar water and
20 with
blue sugar water & counts the # of birds that go to each feeder during 6 hours.
Control?
Independent
variable?
Dependent variable?Slide15
Question: To what extent does blue flowers
affect the hummingbirds visits to the flowers.
Control:
Independent Variable
:
Dependent Variable:
20 feeders with red sugar water
Color of sugar water
# of visits to feeders
If
color of sugar water
changes,
then the
# of visits to the feeders
will increase
.Slide16
Question: To what extent does
eating
french
fries affect
the amount of pimples you
get?Control:
Independent Variable:
Dependent Variable:
k
ids not eating fries
Think of how you would set up the investigation/experiment
.
French fries
n
umber of pimplesSlide17
If the amount of French fries eaten increases,
then the number of pimples will increase.Slide18
Question: To what extent does
dog slobber
affect
the healing rate of a small wound?
Control:
Independent Variable:Dependent Variable:
n
o dog slobber
Think of how you would set up the investigation/experiment
.
d
og slobber
h
ealing rateSlide19
If the dog slobber increases,
then the healing rate will increase
.Slide20
How to format a Question and Hypothesis from variablesSlide21
Hypothesis
Proposed explanation based on prior knowledge
Educated guess (NOT just a guess!)
Doesn’t have to be correct.
If ____________, then ____________ Slide22
Observation:
A Great Dane had a lot of fleas.
A Chihuahua had fewer fleas. Slide23
Inference:
Great Danes have more flea habitat than
chihuahuas
.
Independent Variable:
Dependent Variable:
Size of dog
# of fleasSlide24
Independent Variable:
Dependent Variable:
Hypothesis:
If
size of dog increases,
then
the # of fleas will increase.
Size of dog
# of fleasSlide25
Observation:
The long helicopter blades are rotating (spinning around) slower than the helicopter with shorter blades. Slide26
Inference:
The longer a helicopter's blades, the
slower they
will spin.Slide27
Inference:
The longer a helicopter's blades, the slower they will spin.
Independent Variable:
Dependent Variable:
Length of helicopter blades
Rotation speedSlide28
Independent Variable:
Dependent Variable:
Length of helicopter blades
Rotation speed
If the
i
ndependent variable
increases or decreases,
t
hen the
d
ependent variable
w
ill increase or decrease.
length
of helicopter blades
increases
rotation speed
d
ecrease.Slide29
Observation:
When my cup of milk gets hotter, the chocolate powder dissolves faster. Slide30
Inference:
Chocolate milk will dissolve faster in hotter milk.Slide31
Inference:
Chocolate milk will dissolve faster in hotter milk.
Independent Variable:
Dependent Variable:
Temperature of milk
Dissolving time of chocolate powderSlide32
Independent Variable:
Dependent Variable:
Temperature of milk
Dissolving time of chocolate powder
If the
i
ndependent variable
increases or decreases,
t
hen the
d
ependent variable
w
ill increase or decrease.
t
emperature of milk
increases
d
issolving time of chocolate powder
w
ill increase.Slide33
Observation:
When I was scuba diving at Crater Lake, the water got colder the deeper I went.Slide34
Inference:
The deeper the water, the colder it gets.Slide35
Inference:
The deeper the water, the colder it gets.
Independent Variable:
Dependent Variable:
d
epth of Crater Lake
w
ater temperatureSlide36
Independent Variable:
Dependent Variable:
depth of Crater Lake
water temperature
If the
i
ndependent variable
increases or decreases,
t
hen the
d
ependent variable
w
ill increase or decrease.
Depth of Crater Lake
increases
Water temperature
w
ill decrease.Slide37
Independent variable: Baking soda
Dependent variable: amount of reaction
Hypothesis: If the amount of baking soda increases
,
then the
reaction time increases. Slide38
Come up with your own Observation and Question
Observation
Question
Hypothesis (one partner write this down!)
If _______ increases/decreases, then _________ increases/decreasesSlide39
Practice Writing Hypotheses worksheet